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they dont kno that he has a 3.91 diff, parents will be wondering why they are spending so much more on his gas bill ...

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- Stan Peng -

EUROPROJEKTZ Southeast | Co-Director

Quote:

Originally Posted by drbworld

Need some opinion. Stock Titanium Silver coupe without spoiler, using the 2 Fast 2 furious skyline vinyl scheme. What do you think, do it or not? plus, i think it would look better then what most car members have here.

Actually, in the city it's not going to make much of a difference. I was cruising at 45 mph at 2000 RPM before, and now it's at 2200 RPM. On the highway before, I was doing 90 mph at only 3000 RPM, it's going to be a minimal increase. Gas mileage will suffer little at most. I did a lot of research into that before going in to it. The only time I would really get lower mileage is when I floor it, and I don't do that often.

Nice work Ken, very cool. On top of getting the lower gearing you also get the smaller diff that I'm sure is lighter (apparently in Europe the E46 comes with two different diff sizes).

One question, why didn't you just swap the input flange?

Tim

Thanks Tim! I picked up both diffs, and I think the new one is like 5 lbs. or so lighter than the old one.

I did swap the input flange, but since the diff dimensions are different, the stock driveshaft wouldn't reach. It wasn't a matter of not being able to bolt up, it was a matter of getting the driveshaft to even reach the input flange. To solve this, I needed a driveshaft that was longer.

i don't get it. didn't he say he already took it for a drive and was at 3k rpm's at 90? even if it's 3200, that's not too bad.

and the E36 M3 you referenced...was that a manual? if so, the numbers Ken's using seem accurate...he's got a step tranny. i have a 6sp manual with a 3.46 and i'm running about 3200rpm's at 80mph.

Good job Ken on taking this project on. Wish i could do a 3.64 on my car but i do lots of highway driving and it would kill my mileage.

No, he said he did 90 @ 3k before the swap. The M3 I referenced is mythical...its a mathematical calculation. I believe diffsonline has a calculator on the site if you want to check the math. 3800 will get you around 90 in 6th.

Yikes...good thing you're not supercharged. You wouldn't be in 1st long at all. I did think about going with a lower ratio, but because I autox, I want to still be in 2nd over 60mph because courses are *usually* designed to be ~60 max. From what I hear, STI and EVO Guys hate having to shift to 3rd during their runs. I'd be curious what impact it has on your 1/4 mile times. You wouldn't happen to have a G-Tech Pro or something would ya?

No, he said he did 90 @ 3k before the swap. The M3 I referenced is mythical...its a mathematical calculation. I believe diffsonline has a calculator on the site if you want to check the math. 3800 will get you around 90 in 6th.

OOPS...my mistake. Yeah, the revs will definitely take a hit on the highway in that case. Either way, it's cool that he took the initiative to be the guinea pig on this one.